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How can I draw a pixmap with a background color after the pixmap is constructed from an image?

You can create a second pixmap, fill it with your background color, then draw the original pixmap on top. For example:

  1.     QPixmap filled(original.size());
  2.     QPainter paint(&filled);
  3.     paint.fillRect(0,0,original.width(), original.height(), backgroundColor);
  4.     paint.drawPixmap(0,0,original);
  5.     paint.end();
  6.  

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